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Check out which companies are making headlines before the bell:

Merck (MRK) — The drugmaker earned an adjusted 93 cents per share for the second quarter, two cents a share above estimates. Revenue beat forecasts, and Merck also raised the lower end of its full-year guidance.

Cigna (CI) — The insurance company reported quarterly profit of $1.98 per share, missing estimates of $2.39 a share. Revenue was also below forecasts, as group disability and life insurance results fell shy of expectations. Cigna also cut its full-year forecast.

Spirit Airlines (SAVE) — Spirit posted a quarterly profit of $1.11 per share, topping expectations of $1.08 a share. Revenue fell below Street forecasts, however. The company said it was experiencing pressure on yields and expects that to continue through the summer travel season.

AutoNation (AN) — The car retailer earned $1.08 per share for the second quarter, three cents a share better than estimates. Revenue was slightly short of Street forecasts. The company said it is beginning to see benefits from cost structure and inventory adjustments.

Xerox (XRX) — Xerox came in five cents a share above estimates, with adjusted quarterly profit of 30 cents per share. Revenue was in line with forecasts. The company was able to beat on the bottom line despite slowing sales of printers and copiers, and negative effects from currency fluctuations.

Lexmark (LXK) — The enterprise hardware and software maker reported adjusted quarterly profit of 69 cents per share, six cents a share above estimates. The company also beat on the top line. Lexmark also said that shareholders have approved the company's buyout by a consortium of private-equity investors.

Newell Brands (NWL) — The household products maker earned 78 cents per share for its latest quarter, six cents a share above estimates. Revenue also scored a beat. The company formerly known as Newell Rubbermaid enjoyed strong sales for both legacy brands and those it acquired when it bought Jarden Corp., such as Yankee Candle.

Amazon.com (AMZN) — Amazon reported adjusted quarterly profit of $1.78 per share, well above estimates of $1.11 a share. The online retail giant's revenue also beat estimates, driven by an increase in Prime subscriptions and growth for its cloud services business.

Alphabet (GOOGL) — Alphabet beat estimates by 38 cents a share, with adjusted quarterly earnings of $8.42 per share. Revenue also exceeded Street forecasts. The Google parent saw an increase in users and in its mobile ad business.

Facebook (FB) — Facebook may owe up to $5 billion in additional taxes, according to a Securities and Exchange Commission (SEC) filing. The social media giant said the Internal Revenue Service is looking into the tax implications of the transfer of assets overseas.